LOCATION TATKIK AK

Established Series
MJS/CBB
11/2024

TATKIK SERIES

Depth class: very deep
Drainage class: somewhat poorly drained
Parent material: gravelly loamy alluvium derived from metamorphic and sedimentary rock
Landscape: mountains
Landform: mountain slopes
Microfeature: swales
Slopes: 3 to 45 percent
Mean annual precipitation: about 450 mm (18 in)
Mean annual air temperature: about -4 degrees C. (25 degrees F.)
Frost-free period: 70 to 82 days

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, nonacid Typic Cryaquepts

TYPICAL PEDON: Tatkik silt in an open diamond leaf willow and bluejoint community on a southeast facing concave, linear backslope on a slope of 6 percent at an elevation of 468 m (1,535 ft)

Oi--0 to 9 cm (0 to 4 in); slightly decomposed plant material, dark brown (7.5YR 3/3) moist, brown (7.5YR 5/3) dry; nonsticky, nonplastic; common very fine and many fine roots throughout; moderately acid (pH 5.9); clear boundary. (3 to 10 cm, 1 to 4 in thick)

Oa--9 to 12 cm (4 to 5 in); highly decomposed plant material, dark reddish brown (5YR 2.5/2) moist, dark reddish gray (5YR 4/2) dry; nonsticky, nonplastic; common very fine and many fine roots throughout; slightly acid (pH 6.5); clear wavy boundary. (1 to 4 cm, 0.5 to 2 in thick)

A--12 to 15 cm (5 to 6 in); silt, very dark brown (7.5YR 2.5/2) moist, brown (7.5YR 4/2) dry; moderate medium subangular blocky structure; friable, slightly hard, slightly sticky, slightly plastic; nonsmeary; common fine roots throughout; fine dendritic tubular pores; slightly acid (pH 6.5); clear wavy boundary. (1 to 9 cm, 0.5 to 4 in thick)

Bw--15 to 30 cm (6 to 12 in); gravelly loam, dark grayish brown (10YR 4/2) moist, light brownish gray (10YR 6/2) dry; moderate medium subangular blocky parts to moderate medium granular structure; friable, slightly hard, nonsticky, nonplastic; nonsmeary; few fine roots throughout; fine dendritic tubular pores; 30 percent gravel; neutral (pH 6.9); clear wavy boundary. (5 to 20 cm, 2 to 8 in thick)

Bg1--30 to 55 cm (12 to 22 in); very gravelly silt loam, gray (10YR 5/1) moist, light gray (10YR 7/1) dry; moderate medium subangular blocky parts to moderate medium granular structure; friable, slightly hard, nonsticky, nonplastic; nonsmeary; very fine irregular pores; 20 percent irregular strong brown (7.5YR 4/6) masses of oxidized iron; 40 percent gravel; neutral (pH 7.1); clear wavy boundary. (15 to 40 cm, 6 to 16 in thick)

Bg2--55 to 85 cm (22 to 34 in); extremely gravelly loam, gray (10YR 5/1) moist, light gray (10YR 7/1) dry; moderate medium subangular blocky parts to moderate medium granular structure; friable, slightly hard, nonsticky, nonplastic; nonsmeary; very fine irregular pores; 40 percent irregular strong brown (7.5YR 4/6) masses of oxidized iron; 65 percent gravel; neutral (pH 7.1); clear smooth boundary. (20 to 40 cm, 8 to 16 in thick)

Cg--85 to 200 cm (34 to 79 in); extremely gravelly silt loam, gray (10YR 5/1) moist, light gray (10YR 7/1) dry; massive; friable, slightly hard, nonsticky, nonplastic; nonsmeary; very fine irregular pores; 65 percent gravel; neutral (pH 7.1). (87 to 155 cm, 34 to 61 in thick)

TYPE LOCATION: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey Area, Alaska; latitude 64 degrees 34 minutes 44.44 seconds north, longitude 159 degrees 50 minutes 3.01 seconds west, datum WGS84, UTM north 7161800.22 and UTM east -159.8341695, zone 4W, datum WGS84.

RANGE IN CHARACTERISTICS:

Soil moisture regime: aquic
Soil temperature regime: cryic
Mean annual soil temperature: 0 to 3 degrees C. (32 to 37 degrees F.)
Thickness of organic material: 4 to 14 cm (2 to 6 in)
Thickness of ochric epipedon: 5 to 23 cm (2 to 9 in)
Thickness of cambic horizon: 40 to 100 cm (16 to 40 in)
Depth to redoximorphic concentrations: 10 to 43 cm (4 to 17 in)
Depth to reduced matrix: 25 to 50 cm (10 to 20 in)
Depth to aquic conditions: 25 to 50 cm (10 to 20 in)

O horizons:
Hue: 5YR, 7.5YR, or 10YR
Value: 2 or 3 moist, 4 to 5 dry
Chroma: 1 to 3
Texture: somewhat, moderately, or highly decomposed plant material
Organic matter: 60 to 90 percent
Reaction class: moderately acid to neutral (pH 5.6 to 7.3)

A horizon:
Hue: 7.5YR or 10YR
Value: 2 to 3 moist, 4 to 5 dry
Chroma: 1 to 2
Texture: silt or silt loam
Sand: 0 to 30 percent
Silt: 62 to 99 percent
Clay: 1 to 8 percent
Organic matter: 2 to 8 percent
Reaction class: slightly acid to neutral (pH 6.1 to 7.3)

Bw horizon:
Hue: 10YR, 2.5Y, or 7.5YR
Value: 3 to 4 moist, 5 to 6 dry
Chroma: 2 to 6
Texture: loam, silt loam, or their gravelly analogues
Sand: 0 to 45 percent
Silt: 39 to 88 percent
Clay: 5 to 16 percent
Rock fragments: 5 to 34 percent
Organic matter: 1 to 4 percent
Reaction class: slightly acid to neutral (pH 6.1 to 7.3)

Bg1 horizon:
Hue: 10YR , 2.5Y, or 7.5YR
Value: 4 to 5 moist
Chroma: 1 to 2
Texture: gravelly or very gravelly silt loam or loam
Sand: 5 to 45 percent
Silt: 39 to 83 percent
Clay: 5 to 16 percent
Rock fragments: 15 to 50 percent
Organic matter: 0.5 to 3 percent
Reaction class: slightly acid to neutral (pH 6.1 to 7.3)

Bg2 horizon:
Hue: 10YR, 2.5Y, or 7.5YR
Value: 4 to 5 moist, 6 to 7 dry
Chroma: 1 to 2
Texture: extremely or very gravelly loam or silt loam
Sand: 5 to 45 percent
Silt: 39 to 83 percent
Clay: 5 to 16 percent
Rock fragments: 35 to 70 percent
Organic matter: 0.5 to 3 percent
Reaction class: slightly acid to neutral (pH 6.1 to 7.3)

Cg horizon:
Hue: 10YR or 7.5YR
Value: 5 to 6
Chroma: 1 to 2
Texture: extremely or very gravelly silt loam
Sand: 15 to 45 percent
Silt: 50 to 80 percent
Clay: 5 to 16 percent
Rock fragments: 35 to 70 percent
Organic matter: 0.5 to 3 percent
Reaction class: slightly acid to neutral (pH 6.1 to 7.3)

Some pedons have cobble fragments at depths below 35 cm (14 in)

COMPETING SERIES: This is the Lowder (MT, ID, & WY) series.
Lowder soils are very poorly drained, have a mean annual soil temperature greater than 3 degrees C. (37 degrees F.), and occur on alluvial fans, moraines, swales, and flood plain steps.

GEOGRAPHIC SETTING:
Elevation: 280 to 630 meters (920 to 2,070 feet)
Parent material: gravelly loamy alluvium derived from metamorphic and sedimentary rock
Landform: mountain slopes
Slopes: 3 to 45 percent
Mean annual precipitation: 400 to 600 mm (16 to 24 in)
Mean annual air temperature: -6 to -2 degrees C. (21 to 28 degrees F.)
Frost free period: 70 to 85 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Egoosikcreek, Sagvaktuk, Sikuruk, Tui, Atkaktuk, Continentaldivide, and Brasspancreek soils.
Egoosikcreek soils have a mollic epipedon and occur on mountain swales.
Sagvaktuk soils have a coarse-loamy particle size class and occur on drainageways of mountain valleys.
Sikuruk soils have permafrost within 50 to 100 cm (20 to 40 in) and occur on similar landforms on shoulder positions.
Tui soils are well drained and occur on similar landforms on backslope positions.
Atkaktuk soils have an umbric epipedon and occur on similar landforms on backslope positions.
Continentaldivide soils have a mollic epipedon and occur on ridges of mountains.
Brasspancreek soils do not have a cambic horizon and occur on floodplains of drainageways.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: somewhat poorly drained
Saturated Hydraulic Conductivity: very high in the O horizons, moderately high in the A and Cg horizons, and moderately high to high in the Bw and Bg horizons
Permeability: rapid to very rapid in the O horizons, moderate in the A and Cg horizons, and moderate to moderately rapid in the Bw and Bg horizons
Runoff: very high

USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: splendid feather moss, Schreber's big red stem moss, tealeaf willow, bluejoint, moss, boreal sagebrush, Altai fescue, dwarf raspberry, tall bluebells, arctic sweet coltsfoot, feltleaf willow, and dwarf birch.

DISTRIBUTION AND EXTENT: MLRA 240, Nulato Hills-Southern Seward Peninsula Highlands. The series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska

SERIES ESTABLISHED: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey, Alaska, 2024.

REMARKS: Diagnostic features and horizons recognized in this profile include:

Particle-size control section: 37 to 112 cm (15 to 44 in)

Ochric epipedon: 0 to 15 cm (0 to 6 in) (Oi, Oa, and A horizons)

Cambic horizon: 15 to 85 cm (6 to 33 in) (Bw, Bg1, and Bg2 horizons)

Redoximorphic concentrations: 30 to 85 cm (12 to 33 in) (Bg1 and Bg2 horizons)

Reduced matrix: 30 to 200 cm (12 to 79 in) (Bg1, Bg2, and Cg horizons)

Aquic conditions: 30 to 200 cm (12 to 79 in) (Bg1, Bg2, and Cg horizons)

ADDITIONAL DATA:

User pedon ID: 2021AK290803

National Cooperative Soil Survey
U.S.A.